Find the angle between the following pai...

Find the angle between the following pair of line: `r=2hati-=5hatj+hatk+lamda(3hati+2hatj+6hatk) and vecr=7hati-6hatk+mu(hati+2hatj+2hatk)`

`cos^(-1) (19/21)`

`cos^(1)(21/19)`

`cos^(-1)(15/21)`

`cos^(-1) (21/15)`

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